[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.57' (ECDSA) to the list of known hosts.
2021/04/17 20:37:32 fuzzer started
2021/04/17 20:37:32 dialing manager at 10.128.0.163:40325
2021/04/17 20:37:33 syscalls: 1982
2021/04/17 20:37:33 code coverage: enabled
2021/04/17 20:37:33 comparison tracing: enabled
2021/04/17 20:37:33 extra coverage: enabled
2021/04/17 20:37:33 setuid sandbox: enabled
2021/04/17 20:37:33 namespace sandbox: enabled
2021/04/17 20:37:33 Android sandbox: enabled
2021/04/17 20:37:33 fault injection: enabled
2021/04/17 20:37:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2021/04/17 20:37:33 net packet injection: /dev/net/tun does not exist
2021/04/17 20:37:33 net device setup: enabled
2021/04/17 20:37:33 concurrency sanitizer: enabled
2021/04/17 20:37:33 devlink PCI setup: PCI device 0000:00:10.0 is not available
2021/04/17 20:37:33 USB emulation: /dev/raw-gadget does not exist
2021/04/17 20:37:33 hci packet injection: /dev/vhci does not exist
2021/04/17 20:37:33 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist
2021/04/17 20:37:33 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist
2021/04/17 20:37:35 suppressing KCSAN reports in functions: 'shmem_add_to_page_cache' '__ext4_new_inode' 'n_tty_receive_buf_common' '__ext4_update_other_inode_time' 'step_into' 'expire_timers' 'n_tty_receive_char_special' 'do_sys_poll' 'do_signal_stop' 'blk_mq_rq_ctx_init' 'ext4_free_inode' '__process_echoes' 'dd_has_work' 'ext4_ext_handle_unwritten_extents' '__xa_set_mark' 'ext4_free_inodes_count' 'ext4_ext_insert_extent' 'xas_clear_mark' 'generic_write_end' 'fast_dput' 'blk_mq_dispatch_rq_list' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' 'xas_find_marked' 'ext4_mark_iloc_dirty' 
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syzkaller login: [   24.348765][ T1732] ==================================================================
[   24.351669][ T1732] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me
[   24.354167][ T1732] 
[   24.354645][ T1732] write to 0xffff8881008fa0ac of 4 bytes by task 1729 on cpu 0:
[   24.356335][ T1732]  futex_wait_queue_me+0x198/0x260
[   24.358120][ T1732]  futex_wait+0x143/0x430
[   24.359276][ T1732]  do_futex+0x9e8/0x1e10
[   24.360186][ T1732]  __se_sys_futex+0x2a8/0x390
[   24.361428][ T1732]  __x64_sys_futex+0x74/0x80
[   24.362415][ T1732]  do_syscall_64+0x34/0x50
[   24.363371][ T1732]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   24.365056][ T1732] 
[   24.365564][ T1732] read to 0xffff8881008fa0ac of 4 bytes by task 1732 on cpu 1:
[   24.367321][ T1732]  complete_signal+0x7c/0x600
[   24.368329][ T1732]  __send_signal+0x680/0x760
[   24.372212][ T1732]  send_signal+0x38e/0x3d0
[   24.376838][ T1732]  do_send_specific+0x13d/0x1c0
[   24.382168][ T1732]  __x64_sys_tgkill+0x108/0x140
[   24.387045][ T1732]  do_syscall_64+0x34/0x50
[   24.391554][ T1732]  entry_SYSCALL_64_after_hwframe+0x44/0xae
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[   24.397437][ T1732] 
[   24.399741][ T1732] Reported by Kernel Concurrency Sanitizer on:
[   24.405956][ T1732] CPU: 1 PID: 1732 Comm: syz-fuzzer Not tainted 5.12.0-rc7-syzkaller #0
[   24.414458][ T1732] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   24.424589][ T1732] ==================================================================
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2021/04/17 20:37:46 starting 6 fuzzer processes
20:37:46 executing program 0:
openat$sndtimer(0xffffffffffffff9c, 0x0, 0x0)
clone(0x20002100, 0x0, 0xfffffffffffffffe, 0x0, 0xffffffffffffffff)
r0 = syz_genetlink_get_family_id$nl80211(&(0x7f00000001c0)='nl80211\x00', 0xffffffffffffffff)
r1 = socket$nl_generic(0x10, 0x3, 0x10)
sendmsg$NL80211_CMD_REQ_SET_REG(r1, &(0x7f00000005c0)={0x0, 0x0, &(0x7f0000000580)={&(0x7f0000001680)=ANY=[@ANYBLOB='$\x00\x00\x00', @ANYRES16=r0, @ANYBLOB="010000000000000000001b000000070021"], 0x24}}, 0x0)
exit(0x0)

20:37:46 executing program 1:
r0 = socket$nl_netfilter(0x10, 0x3, 0xc)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000000)='/proc/self/exe\x00', 0x0, 0x0)
mmap(&(0x7f0000000000/0x800000)=nil, 0x800000, 0x380000d, 0x13, r1, 0x0)
getsockopt$netlink(r0, 0x10e, 0x4, 0x0, &(0x7f0000000040))

20:37:46 executing program 2:
r0 = socket$nl_generic(0x10, 0x3, 0x10)
r1 = syz_genetlink_get_family_id$ethtool(&(0x7f0000000000)='ethtool\x00', 0xffffffffffffffff)
sendmsg$ETHTOOL_MSG_LINKMODES_SET(r0, &(0x7f0000000240)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000840)={0x34, r1, 0x1, 0x0, 0x0, {}, [@ETHTOOL_A_LINKMODES_HEADER={0x18, 0x1, 0x0, 0x1, [@ETHTOOL_A_HEADER_DEV_NAME={0x14, 0x2, 'syz_tun\x00'}]}, @ETHTOOL_A_LINKMODES_DUPLEX={0x5, 0x7}]}, 0x34}}, 0x0)

20:37:46 executing program 3:
r0 = mq_open(&(0x7f0000000380)='[^\x00', 0x0, 0x0, 0x0)
mq_timedreceive(r0, &(0x7f0000000000)=""/230, 0xe6, 0x0, 0x0)
mq_timedreceive(r0, &(0x7f00000008c0)=""/57, 0x39, 0x0, 0x0)

20:37:46 executing program 5:
r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000000000)='/dev/ptmx\x00', 0x0, 0x0)
r1 = epoll_create(0x10007fff)
sendto$inet6(0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0)
sendto$inet6(0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0)
ioctl$TCSETS(r0, 0x40045431, &(0x7f0000000040))
r2 = syz_open_pts(r0, 0x0)
r3 = openat(0xffffffffffffff9c, &(0x7f0000000000)='/proc/self/exe\x00', 0x0, 0x0)
mmap(&(0x7f0000000000/0x800000)=nil, 0x800000, 0x1800003, 0x12, r3, 0x0)
preadv(r3, &(0x7f0000000280), 0x18, 0xd9f, 0x0)
r4 = syz_open_pts(r0, 0x0)
dup3(r1, r0, 0x0)
dup3(r1, r2, 0x0)
dup2(r2, r4)

20:37:46 executing program 4:
syz_mount_image$ext4(&(0x7f0000000000)='ext4\x00', &(0x7f0000000100)='./file0\x00', 0x4030014, 0x3, &(0x7f0000000300)=[{&(0x7f0000000080)="20000000000100000c000000ce0000000f000000130000000000000000000000002000000020000020000000d7f4655fd7f4655f0100ffff53ef", 0x3a, 0x400}, {&(0x7f0000010400)="2e0000001300000023", 0x9, 0x800}, {&(0x7f0000012b00)="ed41000000040000d7f4655fd7f4655fd7f4655f000000000000040002", 0x1d, 0x8c80}], 0x0, &(0x7f0000013800)=ANY=[])

[   30.427222][   T23] audit: type=1400 audit(1618691866.811:8): avc:  denied  { execmem } for  pid=1746 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   30.549298][ T1753] cgroup: Unknown subsys name 'perf_event'
[   30.565696][ T1753] cgroup: Unknown subsys name 'net_cls'
[   30.588261][ T1755] cgroup: Unknown subsys name 'perf_event'
[   30.594389][ T1755] cgroup: Unknown subsys name 'net_cls'
[   30.614196][ T1757] cgroup: Unknown subsys name 'perf_event'
[   30.618306][ T1759] cgroup: Unknown subsys name 'perf_event'
[   30.620329][ T1757] cgroup: Unknown subsys name 'net_cls'
[   30.633209][ T1759] cgroup: Unknown subsys name 'net_cls'
[   30.639670][ T1758] cgroup: Unknown subsys name 'perf_event'
[   30.649537][ T1762] cgroup: Unknown subsys name 'perf_event'
[   30.659134][ T1758] cgroup: Unknown subsys name 'net_cls'
[   30.666229][ T1762] cgroup: Unknown subsys name 'net_cls'